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OpenGL 3.1 is a little special when it comes to compatibility. If
a 3.1 compat profile is requested by piglit and ARB_compatibility
not supported waffle will end up creating a core profile for us.
Here we make sure ARB_compatibility is supported when explicitly
requesting a 3.1 compat profile from piglit. This allows us to
avoid testing for ARB_compatibility in all GL 3.1 compat tests.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106277